QUESTIONS $3[25$marks$]$

In a bright sunny day, the wind speed is assumed to be $6\frac{m}{s}$ and horizontal. A

power plant in a rural area with a stack of $100m$ high continuously discharges SO$2$

into the atmosphere at a stable rate of $0\mathrm{.}1k\frac{g}{s}.$ The plume rise is $20m.$ Ignoring

the chemical reactions in the atmosphere.

a$)$ Estimate the $SO2$ concentration at the center of the plume $5km$ downwind from

the stack.

b$)$ Estimate the ground level $SO2$ concentration at $5km$ downwind

c$)$ Plot the ground$-$level concentration right under the plume